Elastic-fluid turbine.



B. LJUNGSTRUM. "ELASTIC FLUID TURBINE. APPLIOATION FILED MAR.15. 1909.

926,814 i atented July 6, 1909;

M iii" H i 1 UNITED STATES PATENT OFFICE.

BIl-LGEB LJUNGSTRM, OF STOUKHOLM, SWEDEN. ASSIGNOR TO AKTIEBOLA'GET LJUNG- I OF STOCKHOLM, SWEDEN, A COMPANY OF SWEDEN.

s'raoMs ANGTURBIN,

anaemic-FLUID TURBINE.

Specification of Letters Patent.

Patented July 6, 1909.

Application filed latch 15, 1909. SerialNo. 483,507.

\ To all whom it may concern:

' driving Be it known that I, BIRGER LJcncs'raoim a subject of the King of Sweden, and residing at Grefmagnigatan 18, Stockholm, Sweden, have inyented certain new and useful Improvements in ElasticeFluid Turbines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertaina to make and use the same, reference beinghmd to the accompanying drawings, and w figures of "reference marked thereon, whichhwm a part of this specification. 6- i The present invention relates to an arrangement in radial turbines, having gradual expansion of the driving medium in ccncen trically placed vane rings, meshing with each other and has more especially reference to the vane disks in such turbines. 1

The driving medium, which is introduced centrally, will heat the central part of the vane disk or disks to a high temperature and when the driving medium flows outwardly and expands, its temperature falls, and of course the vane disks, which are in contact with the driving medium, will get a high temperature at the center and a low one at the periphery. This difference in temperature will be rather great especially when the vane disks .on bothflsides are passed by the medium. The strains in the disks from this difference oftemperature therein, can easily change the shape of the vane disks, so that these when lane in cold state will buckle or when buc ed in cold state will buckle still more. In order that such a change in the shape of the vane disks may not cause that the parts rotating relatively to each other come into contact with each other the play between those parts must be made relatively great, which will cause that the losses on account of the leakage will be unnecessarily great, es ecially when superheated steam is used, as t ion the difference in temperature will be considerable, on account whereof the dilatation will be great and the plays must then be made relatively great.

arising According to the present invention the abovenamed inconvenience will be avoided, since the vane-disk is constructed in such a way that it cannot change its shape in axial direction under the influence oi the heat.

composed of concentric This is performed by making the disk from a series of rings, arranged in each other and leaving between them in cold state small interspaces. When the rings are heated to differenttempcratures, they can dilate independent of each other and on account thereof the strains in the disk cannot arise.

()n the drawing several forms of the invention are shown.

On the Figures 1 and 2 1, 3- and -4 designate four concentric rings, of gradually increasing diameter, which 'are inserted in each other and partly overlap each other, leaving small interspaces -5- )etween them. The overlappingparts of said rings are screw-tapped to permit them to be connected with each other by means of screws -6-'. The vane rings are marked 7.

In the Fi s. 3 and 4, 8 9- and -10 are t 1e rings arranged as in Figs. 1 and 2 but connected by means of radially arran ed screws 1 1.

In ig. 5 the rings are provided with an nular grooves or the like -l2-, in order that they may be of relatively small weight.

In Fig. 6 the rin s are provided with WlllCl abut against each other. The rings are connected with each other by means of the screws --l4-, passing through the said flanges. The radial strains arlsingxin the rings, cannot by this arrangement transmitted from the one ring to the other.

the'form shown in Figs. 7 and 8 the 15 and 16- are united by means of t e flanges 17 abutting against each other and by the ring 18-, abutting against the rmg -16' and inserted in a groove in the rm 15. Between the rings -l6- and t e rings 19 keys are arranged.

The radial interspaces between the rings can be used as passages for the driving medium, in order to avoid overloading of the turbine and equalize the axial pressure.

Claims.

1. In radial elastic fluid turbines, a disk,

rings successively increasin in diameter," inserted in eac 1 other an having1 when in cold state interspaces between t em.

2. In radial elastic fluid turbines, a-vane disk, composed of concentric rings, inserted in each other and partly overlnppin each other but successively increasing in fiameand hzwiz'lg when n 661d state interspaces between them, said rings being con nected to can nt-her i: v points at the peripi disk,

compose" 01 Times other andiiuwing W1, spaces n nested v" (F MAD Inected to each other by means of screws,

extending axiaily between the rings.

5. In radial elastic fluid turbines, a vane d'hk, umnpescd 0i rings, insel'tud in each nd having when in 0010! state inter- Jemvaen them, mic! rings being pro 11 mnmhn' grooves. 'i wny, that I claim he foregoing {is 1, I have signed my name in mm subSmribing Witnesses.

BER GER LJUNGSTRUZQ. 

